If you do not know where DHL offices are located in Nigeria, I will explain to you how you can easily locate them via the DHL website. Right from the DHL website, you will be able to get the updated locations or addresses of DHL offices in Nigeria.
At any of the DHL addresses in Nigeria, you can collect your shipment or leave a shipment for delivery.
Go to : http://www.dhl.com/en/express/shipping/find_dhl_locations.html
You will see a form to fill. In the "Select your location" drop down box, select "Nigeria".
Leave other options and click "Go"
A new window will open with a list of some states where DHL offices are located in Nigeria. Click on the "red icon" next to the state nearest to you to view the addresses of DHL offices in the state and their opening hours.
If you are a Google Adsense publisher, you might be interested in "How to receive Google Adsense checks via DHL in Nigeria" and "How to track Adsense checks on DHL website".